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netfilter: x_tables: validate e->target_offset early 

We should check that e->target_offset is sane before
mark_source_chains gets called since it will fetch the target entry
for loop detection.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-03-22 18:02:49 +01:00 committed by Pablo Neira Ayuso
parent 99b7248e2a
commit bdf533de69
3 changed files with 24 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/ipv4/netfilter/arp_tables.c
View File

@ -474,14 +474,12 @@ static int mark_source_chains(const struct xt_table_info *newinfo,
return 1;
}
static inline int check_entry(const struct arpt_entry *e, const char *name)
static inline int check_entry(const struct arpt_entry *e)
{
const struct xt_entry_target *t;
if (!arp_checkentry(&e->arp)) {
duprintf("arp_tables: arp check failed %p %s.\n", e, name);
if (!arp_checkentry(&e->arp))
return -EINVAL;
}
if (e->target_offset + sizeof(struct xt_entry_target) > e->next_offset)
return -EINVAL;
@ -522,10 +520,6 @@ find_check_entry(struct arpt_entry *e, const char *name, unsigned int size)
struct xt_target *target;
int ret;
ret = check_entry(e, name);
if (ret)
return ret;
e->counters.pcnt = xt_percpu_counter_alloc();
if (IS_ERR_VALUE(e->counters.pcnt))
return -ENOMEM;
@ -576,6 +570,7 @@ static inline int check_entry_size_and_hooks(struct arpt_entry *e,
unsigned int valid_hooks)
{
unsigned int h;
int err;
if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 ||
(unsigned char *)e + sizeof(struct arpt_entry) >= limit) {
@ -590,6 +585,10 @@ static inline int check_entry_size_and_hooks(struct arpt_entry *e,
return -EINVAL;
}
err = check_entry(e);
if (err)
return err;
/* Check hooks & underflows */
for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
if (!(valid_hooks & (1 << h)))
@ -1246,7 +1245,7 @@ check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
}
/* For purposes of check_entry casting the compat entry is fine */
ret = check_entry((struct arpt_entry *)e, name);
ret = check_entry((struct arpt_entry *)e);
if (ret)
return ret;

17
net/ipv4/netfilter/ip_tables.c
View File

@ -569,14 +569,12 @@ static void cleanup_match(struct xt_entry_match *m, struct net *net)
}
static int
check_entry(const struct ipt_entry *e, const char *name)
check_entry(const struct ipt_entry *e)
{
const struct xt_entry_target *t;
if (!ip_checkentry(&e->ip)) {
duprintf("ip check failed %p %s.\n", e, name);
if (!ip_checkentry(&e->ip))
return -EINVAL;
}
if (e->target_offset + sizeof(struct xt_entry_target) >
e->next_offset)
@ -666,10 +664,6 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
struct xt_mtchk_param mtpar;
struct xt_entry_match *ematch;
ret = check_entry(e, name);
if (ret)
return ret;
e->counters.pcnt = xt_percpu_counter_alloc();
if (IS_ERR_VALUE(e->counters.pcnt))
return -ENOMEM;
@ -741,6 +735,7 @@ check_entry_size_and_hooks(struct ipt_entry *e,
unsigned int valid_hooks)
{
unsigned int h;
int err;
if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
(unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
@ -755,6 +750,10 @@ check_entry_size_and_hooks(struct ipt_entry *e,
return -EINVAL;
}
err = check_entry(e);
if (err)
return err;
/* Check hooks & underflows */
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
if (!(valid_hooks & (1 << h)))
@ -1506,7 +1505,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
}
/* For purposes of check_entry casting the compat entry is fine */
ret = check_entry((struct ipt_entry *)e, name);
ret = check_entry((struct ipt_entry *)e);
if (ret)
return ret;

17
net/ipv6/netfilter/ip6_tables.c
View File

@ -581,14 +581,12 @@ static void cleanup_match(struct xt_entry_match *m, struct net *net)
}
static int
check_entry(const struct ip6t_entry *e, const char *name)
check_entry(const struct ip6t_entry *e)
{
const struct xt_entry_target *t;
if (!ip6_checkentry(&e->ipv6)) {
duprintf("ip_tables: ip check failed %p %s.\n", e, name);
if (!ip6_checkentry(&e->ipv6))
return -EINVAL;
}
if (e->target_offset + sizeof(struct xt_entry_target) >
e->next_offset)
@ -679,10 +677,6 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
struct xt_mtchk_param mtpar;
struct xt_entry_match *ematch;
ret = check_entry(e, name);
if (ret)
return ret;
e->counters.pcnt = xt_percpu_counter_alloc();
if (IS_ERR_VALUE(e->counters.pcnt))
return -ENOMEM;
@ -753,6 +747,7 @@ check_entry_size_and_hooks(struct ip6t_entry *e,
unsigned int valid_hooks)
{
unsigned int h;
int err;
if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
(unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
@ -767,6 +762,10 @@ check_entry_size_and_hooks(struct ip6t_entry *e,
return -EINVAL;
}
err = check_entry(e);
if (err)
return err;
/* Check hooks & underflows */
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
if (!(valid_hooks & (1 << h)))
@ -1518,7 +1517,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
}
/* For purposes of check_entry casting the compat entry is fine */
ret = check_entry((struct ip6t_entry *)e, name);
ret = check_entry((struct ip6t_entry *)e);
if (ret)
return ret;